Lack of reversal of daunorubicin resistance in HL60/AR cells by cyclosporin A

Anticancer Res. Nov-Dec 1992;12(6B):2127-32.


Cyclosporin A and verapamil are substrates for P-glycoprotein. Both agents are known to reverse multidrug resistance in cells overexpressing P-glycoprotein. In this investigation, we have examined the effects of cyclosporin A and verapamil on multidrug resistance in HL60/AR cells that lack P-glycoprotein. In addition, a correlation was sought between an alteration in plasma membrane potential as measured with cationic dye DIOC5 and overexpression of P-glycoprotein. HL60/AR cells accumulated 3 fold less daunorubicin than HL60 cells. The drug accumulation defect and drug resistance in HL60/AR cells were partially corrected by verapamil and buthionine sulfoximine. However, cyclosporin A had no detectable effect on daunorubicin accumulation or drug resistance in HL60/AR cells. The multidrug resistant P338/ADR cell line overexpressed P-glycoprotein and exhibited depolarization of plasma membrane when compared to its corresponding drug sensitive parental cell line. In contrast, HL60/AR cells lacked P-glycoprotein and plasma membrane potentials were similar to those of drug sensitive HL60 cells. These results suggest that [1] verapamil modulates daunorubicin transport by a mechanism independent of P-glycoprotein, [2] the mechanisms of reversal of multidrug resistance by verapamil and cyclosporin A are distinct, and [3] the plasma membrane depolarization in multidrug resistant cell lines that overexpress P-glycoprotein, as determined by DIOC5, may be due to an increased efflux of cationic dye by P-glycoprotein, rather than a true measurement of plasma membrane potential in multidrug resistant cells.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B, Member 1
  • Buthionine Sulfoximine
  • Cell Membrane / drug effects
  • Cell Membrane / physiology
  • Cyclosporine / pharmacology*
  • Daunorubicin / pharmacology*
  • Drug Resistance / physiology*
  • Humans
  • Kinetics
  • Leukemia, Promyelocytic, Acute
  • Membrane Glycoproteins / metabolism
  • Membrane Potentials / drug effects
  • Methionine Sulfoximine / analogs & derivatives
  • Methionine Sulfoximine / pharmacology
  • Tumor Cells, Cultured
  • Verapamil / pharmacology


  • ATP Binding Cassette Transporter, Subfamily B, Member 1
  • Membrane Glycoproteins
  • Methionine Sulfoximine
  • Buthionine Sulfoximine
  • Cyclosporine
  • Verapamil
  • Daunorubicin